Of Watford's 14, 10 came from Italian club Udinese, including four of Monday's starting lineup.
Udinese represents my region: if you come from Friuli, you have to be a Udinese fan.
Meanwhile in Serie A, league leaders Juventus recorded an emphatic 4-0 win against Udinese.
Gyan began his career with Liberty Professionals in Ghana before moving to Italian side Udinese in 2003.
Antonio di Natale scored twice and Luis Muriel was also on target as Udinese eased to victory.
He demanded that Coni verify that the sample tested was the one he provided during the Udinese game.
Udinese's disappointing start to the season continued after they were held to a goalless draw by Genoa .
He joined Portsmouth from Italy's Udinese in May but has come in for criticism for his disciplinary record.
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Hodgson, 62, is vastly experienced in world football having coached Inter Milan, Udinese, Blackburn and the Swiss national side.
"It's almost a shame he discovered the role of center-forward so late in his career, " said Udinese coach Guidolin.
His prolific streak has transformed Udinese from relegation candidates into improbable title contenders.
The Inter Milan striker tested positive for the banned substance Nandrolone after a league match against Udinese on 27 September.
Palermo climbed up to fourth on goal difference, beating Udinese 1-0 at home with an 87th-minute goal from Cesare Bovo.
Inter boosted their hopes with a last-gasp 2-1 win over Udinese on Saturday to shrug off a previous defeat to Sampdoria.
The 50-year-old, who has led Udinese, Napoli, Reggina, Genoa and more recently Siena, has signed a three-year contract at Loftus Road.
In Italy's Serie A , fourth-placed Udinese's Champions League hopes were dented by a 0-0 draw with mid-table Chievo on Saturday.
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Udinese's 1-0 win over Cagliari sees them move up to fifth place, four points behind Fiorentina, who travel to Sampdoria on Sunday.
Meanwhile in Serie A's only Saturday fixture, Udinese and Roma drew 1-1.
The result left Udinese two points behind third-placed Lazio, who play on Sunday along with leaders Juventus and title-chasing deefnding champions AC Milan.
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In Saturday's other game, top scorer Antonio Di Natale returned from suspension to inspire Udinese to a 2-0 win at home to struggling Livorno.
He had a trial with Arsenal as a 21-year-old before leaving Danish side B93 for Udinese, where he played under Fulham boss Roy Hodgson.
The former Manchester City striker put his side 1-0 up with a left-foot volley after 25 minutes against Udinese, who leveled through Giampiero Pinzi.
The former Scotland boss also revealed that the loan deal for Udinese defender Nikola Vujadinovic will be extended to cover the rest of the season.
Zaccheroni led AC Milan to the Serie A title in 1999 and has also coached Inter Milan, Lazio and Udinese in the top Italian league.
The incident took place in Arsenal's Champions League play-off with Udinese.
Elsewhere, Udinese eased to a 3-0 win at Parma, while Palermo finished 1-1 against Bologna, Chievo finished goalless against Catania and Genoa drew 1-1 with Sampdoria.
Inter loses 1-0 at home to bottom of the table Novara while the day before Milan come from a goal down to beat Udinese away from home.
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"We showed for large parts of the game we were more than capable of matching them, but they have quality, " former Inter Milan and Udinese boss Hodgson said.
Juve's defeat will have come as a relief to Inter, which is already nine points off the pace and was beaten 3-0 by Udinese in Sunday's early game.
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